Slide 1

Neuroendocrine Responses6Melatonin suppression in response to exposure to bright light is still demonstrable. It is probably mediated via a small sub-population of retinal ganglion cells which continue to project directly to the hypothalamus (Moore et al., 1995)Reflexive responses in blindsight . . -OKN -." ( -OKN ) -V1

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Stoerig & Cowey, 1997

Implicit processing : Redundant stimulus effect(C. Marzi) . (E. Warrington). -afterimage .Phi-phenomenon http://www1.psych.purdue.edu/Magniphi/ARVODemo.html ( "") ( "").8Implicit face recognition in prosopagnosia31

EDWARD H. F. DE HAAN

Jason J S BartonP300 evidence for covert recognition52

P.M. prosopagnosique: visages non reconnus. En traits pleins : 3 prsentations; en pointilles:12 prsentations. Positif vers le bas.P.M. prosopagnosique: visages inconnus bonne rponse. En traits pleins : 3 prsentations; en pointilles: 12 prsentations. Positif vers le bas.Debruille et al., Neurophysiologie Clinique 1989Implicit processing of face expressions34

Hillel AviezerDirect (explicit) processing . ( forced-choice). . . . . ( / (. , DB .

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Target detection in right and left hemifields

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+Target = Flower0%10%20%30%40%50%60%70%80%45%FaceChair81.7%81.2%Contralateral StimulusTarget on the rightTarget on the left43.8%53How information can by-pass the V1?Cowey & Stoerig (1989): Information from a degenerated retina (in the monkey) can reach extrastriate visual areas either directly from the retino-recipient subcortical nuclei, dorsal lateral geniculate nucleus (dLGN) and inferior pulvinar, or indirectly via other retino-recipient structures (pregeniculate nucleus, olivary nucleus, etc). All of these project to other mid-brain structures, notably the superior colliculus, which in turn project to the dLGN and the inferior pulvinar.

Studies of monkeys, whose striate cortex was ablated, indicate that the extrastriate cortical areas that form the dorsal stream retain much of their visual responsiveness. In contrast cells in the ventral stream that respond to stimulation of the blind field are rarely encountered. The ventral stream appears to be more dependent on striate cortex for its visual responsiveness (Bullier et al., 1993).

As we have seen, in blindsight patients we also see extrastriate activity with completely destroyed striate cortex or absence to input to it. It stands to reason that the information reaching the extrastriate areas gets there directly from the thalamus (pulvinar?).12Blindsight summary and conclusions . ( 1V) . ( ) . blindsight . : 4/20 (Marzi et al, 1986), 14/22 (Weiskrantz, 1908), 6/10 (Stoerig, 1987). blindsight- . ( -visual field restitution.)13 - SE15 52 bilateral ischemic stroke (posterior cerebral artery) .

Right dorsalRL

Left VentralRLSE : :Topographical Agnosia : (letter by letter ) 4-5 .

16 - Integrative Agnosia

( ) : Kanizsa. . . . .

TPJ :

17 ? :BNT : 13/50 optic aphasia PALPA:: 77% 92% 8%

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? Emergence : SE SE . : ( ) .19 SE ? 1 : : . : RT Congruent < Incongruent Congruent > Incongruent -Incongruent. (Global Interference)

: 1: 2: CongruentIncongruentGlobalLocal2020

1 : 47.6% - chance level 61% congruent. -73%

*p